CMake: Fix clean target

Always list a "all" and "clean" targets and remove the similar code
in the tealeaf reader.

This fixes the clean-step falling back to "all" in server-mode.

Task-number: QTCREATORBUG-17138
Change-Id: I1ce84f03c2e9829e4bb5f550c10cdef772fabf5b
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/cmakeprojectmanager/cmakecbpparser.cpp

@@ -180,15 +180,6 @@ bool CMakeCbpParser::parseCbpFile(CMakeTool::PathMapper mapper, const FileName &
 
         fi.close();
 
-        // There is always a clean target:
-        CMakeBuildTarget cleanTarget;
-        cleanTarget.title = "clean";
-        cleanTarget.targetType = UtilityType;
-        cleanTarget.workingDirectory = m_buildDirectory;
-        cleanTarget.sourceDirectory = m_sourceDirectory;
-
-        m_buildTargets.append(cleanTarget);
-
         return true;
     }
     return false;